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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2007 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.collect;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import com.google.common.annotations.GwtCompatible;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import com.google.common.annotations.GwtIncompatible;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.io.IOException;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.io.ObjectInputStream;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.io.ObjectOutputStream;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.HashMap;<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>/**<a name="line.27"></a>
<span class="sourceLineNo">028</span> * Multiset implementation backed by a {@link HashMap}.<a name="line.28"></a>
<span class="sourceLineNo">029</span> *<a name="line.29"></a>
<span class="sourceLineNo">030</span> * @author Kevin Bourrillion<a name="line.30"></a>
<span class="sourceLineNo">031</span> * @author Jared Levy<a name="line.31"></a>
<span class="sourceLineNo">032</span> * @since 2.0 (imported from Google Collections Library)<a name="line.32"></a>
<span class="sourceLineNo">033</span> */<a name="line.33"></a>
<span class="sourceLineNo">034</span>@GwtCompatible(serializable = true, emulated = true)<a name="line.34"></a>
<span class="sourceLineNo">035</span>public final class HashMultiset&lt;E&gt; extends AbstractMapBasedMultiset&lt;E&gt; {<a name="line.35"></a>
<span class="sourceLineNo">036</span><a name="line.36"></a>
<span class="sourceLineNo">037</span>  /**<a name="line.37"></a>
<span class="sourceLineNo">038</span>   * Creates a new, empty {@code HashMultiset} using the default initial<a name="line.38"></a>
<span class="sourceLineNo">039</span>   * capacity.<a name="line.39"></a>
<span class="sourceLineNo">040</span>   */<a name="line.40"></a>
<span class="sourceLineNo">041</span>  public static &lt;E&gt; HashMultiset&lt;E&gt; create() {<a name="line.41"></a>
<span class="sourceLineNo">042</span>    return new HashMultiset&lt;E&gt;();<a name="line.42"></a>
<span class="sourceLineNo">043</span>  }<a name="line.43"></a>
<span class="sourceLineNo">044</span><a name="line.44"></a>
<span class="sourceLineNo">045</span>  /**<a name="line.45"></a>
<span class="sourceLineNo">046</span>   * Creates a new, empty {@code HashMultiset} with the specified expected<a name="line.46"></a>
<span class="sourceLineNo">047</span>   * number of distinct elements.<a name="line.47"></a>
<span class="sourceLineNo">048</span>   *<a name="line.48"></a>
<span class="sourceLineNo">049</span>   * @param distinctElements the expected number of distinct elements<a name="line.49"></a>
<span class="sourceLineNo">050</span>   * @throws IllegalArgumentException if {@code distinctElements} is negative<a name="line.50"></a>
<span class="sourceLineNo">051</span>   */<a name="line.51"></a>
<span class="sourceLineNo">052</span>  public static &lt;E&gt; HashMultiset&lt;E&gt; create(int distinctElements) {<a name="line.52"></a>
<span class="sourceLineNo">053</span>    return new HashMultiset&lt;E&gt;(distinctElements);<a name="line.53"></a>
<span class="sourceLineNo">054</span>  }<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span>  /**<a name="line.56"></a>
<span class="sourceLineNo">057</span>   * Creates a new {@code HashMultiset} containing the specified elements.<a name="line.57"></a>
<span class="sourceLineNo">058</span>   * <a name="line.58"></a>
<span class="sourceLineNo">059</span>   * &lt;p&gt;This implementation is highly efficient when {@code elements} is itself<a name="line.59"></a>
<span class="sourceLineNo">060</span>   * a {@link Multiset}.<a name="line.60"></a>
<span class="sourceLineNo">061</span>   * <a name="line.61"></a>
<span class="sourceLineNo">062</span>   * @param elements the elements that the multiset should contain<a name="line.62"></a>
<span class="sourceLineNo">063</span>   */<a name="line.63"></a>
<span class="sourceLineNo">064</span>  public static &lt;E&gt; HashMultiset&lt;E&gt; create(Iterable&lt;? extends E&gt; elements) {<a name="line.64"></a>
<span class="sourceLineNo">065</span>    HashMultiset&lt;E&gt; multiset =<a name="line.65"></a>
<span class="sourceLineNo">066</span>        create(Multisets.inferDistinctElements(elements));<a name="line.66"></a>
<span class="sourceLineNo">067</span>    Iterables.addAll(multiset, elements);<a name="line.67"></a>
<span class="sourceLineNo">068</span>    return multiset;<a name="line.68"></a>
<span class="sourceLineNo">069</span>  }<a name="line.69"></a>
<span class="sourceLineNo">070</span><a name="line.70"></a>
<span class="sourceLineNo">071</span>  private HashMultiset() {<a name="line.71"></a>
<span class="sourceLineNo">072</span>    super(new HashMap&lt;E, Count&gt;());<a name="line.72"></a>
<span class="sourceLineNo">073</span>  }<a name="line.73"></a>
<span class="sourceLineNo">074</span><a name="line.74"></a>
<span class="sourceLineNo">075</span>  private HashMultiset(int distinctElements) {<a name="line.75"></a>
<span class="sourceLineNo">076</span>    super(Maps.&lt;E, Count&gt;newHashMapWithExpectedSize(distinctElements));<a name="line.76"></a>
<span class="sourceLineNo">077</span>  }<a name="line.77"></a>
<span class="sourceLineNo">078</span><a name="line.78"></a>
<span class="sourceLineNo">079</span>  /**<a name="line.79"></a>
<span class="sourceLineNo">080</span>   * @serialData the number of distinct elements, the first element, its count,<a name="line.80"></a>
<span class="sourceLineNo">081</span>   *     the second element, its count, and so on<a name="line.81"></a>
<span class="sourceLineNo">082</span>   */<a name="line.82"></a>
<span class="sourceLineNo">083</span>  @GwtIncompatible("java.io.ObjectOutputStream")<a name="line.83"></a>
<span class="sourceLineNo">084</span>  private void writeObject(ObjectOutputStream stream) throws IOException {<a name="line.84"></a>
<span class="sourceLineNo">085</span>    stream.defaultWriteObject();<a name="line.85"></a>
<span class="sourceLineNo">086</span>    Serialization.writeMultiset(this, stream);<a name="line.86"></a>
<span class="sourceLineNo">087</span>  }<a name="line.87"></a>
<span class="sourceLineNo">088</span><a name="line.88"></a>
<span class="sourceLineNo">089</span>  @GwtIncompatible("java.io.ObjectInputStream")<a name="line.89"></a>
<span class="sourceLineNo">090</span>  private void readObject(ObjectInputStream stream)<a name="line.90"></a>
<span class="sourceLineNo">091</span>      throws IOException, ClassNotFoundException {<a name="line.91"></a>
<span class="sourceLineNo">092</span>    stream.defaultReadObject();<a name="line.92"></a>
<span class="sourceLineNo">093</span>    int distinctElements = Serialization.readCount(stream);<a name="line.93"></a>
<span class="sourceLineNo">094</span>    setBackingMap(<a name="line.94"></a>
<span class="sourceLineNo">095</span>        Maps.&lt;E, Count&gt;newHashMapWithExpectedSize(distinctElements));<a name="line.95"></a>
<span class="sourceLineNo">096</span>    Serialization.populateMultiset(this, stream, distinctElements);<a name="line.96"></a>
<span class="sourceLineNo">097</span>  }<a name="line.97"></a>
<span class="sourceLineNo">098</span><a name="line.98"></a>
<span class="sourceLineNo">099</span>  @GwtIncompatible("Not needed in emulated source.")<a name="line.99"></a>
<span class="sourceLineNo">100</span>  private static final long serialVersionUID = 0;<a name="line.100"></a>
<span class="sourceLineNo">101</span>}<a name="line.101"></a>




























































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